| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve surface finish and to eliminate the adverse effect on post-processing by preliminarily applying an aq. surfactant soln. to the surface of a mold formed from a synthetic resin or rubber material into which a specific curable material is injected. SOLUTION: When a curable material consisting of 100 pts.wt. of an SiO2 -Al2 O3 type inorg. powder, 0.2-450 pts.wt. of alkali metal silicate and 35-1500 pts.wt. of water is injected in a mold of which the surface is formed from a synthetic resin or rubber material to be cured, an aq. surfactant soln. is preliminarily applied to the surface of the mold. The synthetic resin or rubber material has hydrophobicity and, when an aq. slurry comes into contact therewith, 'repellency' is generated. When the aq. surfactant soln. is applied to the hydrophobic groups present on the surface of a resin mold, the hydrophobic groups of the surfactant are arranged on the resin side and hydrophilic groups are arranged on the surface side of the mold and the repellency between the curable material and the surface of the mold is prevented. Therefore, the surface finish of a cured object is beautiful and no adverse effect is exerted on post-processing such as painting.</p> |
